@SLTCEJSometimes such a long loading will be caused by too many objects in the library - in your Tray folder. Especially if you have never deleted the houses that Maxis has added to your library. You can throw these houses away - you'll always have access to them if you want.
If the reason is in your computer this information you provided is not sufficient could you post your Computer's DxDiag?
To gather a DxDiag on your computer, please follow the steps here:
https://help.ea.com/en-us/help/pc/how-to-gather-dxdiag-information/Press the Windows key and "R" at the same time.
Copy and paste or type "DxDiag" in the new field. (Without the quotes)> ENTER
Wait until the green bar is gone> Click on "Save all information"
Save the file to your desktop
Here at AHQ> click on "Reply"> click on "choose file"> navigate to the "DxDiag.txt" on your desktop. > select the "DxDiag.txt"> click on "Open" type a few words in the text box> click on "Submit"
I don't work for EA